Python Intermediate

🚀 Welcome to Python Intermediate! Now that you’re familiar with the basics, it’s time to level up. In this section, you’ll deepen your understanding of how Python works by exploring Indexing, Conditional Statements, and Loops. These tools are essential for writing efficient, flexible code — and they’re at the core of every real-world data science workflow. Let’s build on your foundation and start coding with more power and control!

Summary Table

Summary of the Python Intermediate section.

Concept	Example	Description
Zero-based index	data[0]	Access the first element or character
Negative index	data[-1]	Access the last element or character
Nested indexing	data[0][1]	Access an element or character within a nested structure
String indexing	"Text"[0]	Access a character in a string
Slice range	data[2:10]	Elements or characters from index 2 up to (not including) 10
Slice from start	data[:3]	First 3 elements or characters
Slice to end	data[4:]	Elements or characters from index 4 to the end
Full slice	data[:]	Copy all elements or characters
Reversing	data[::-1]	Reverse the list or string
if	if condition:	Run block only if condition is True
else	else:	Run if all previous conditions are False
elif	elif condition:	Additional check after if
Logical Operators	and, or, not	Combine or negate multiple conditions
Nested Conditional Statements	if ... if ...	Place one conditional inside another
Truthy/Falsy	if [], if "text"	Empty values are False, non-empty are True
for Loops	for item in sequence:	Iterate over elements in a sequence
List Comprehension	[x for x in sequence]	Create a list using a loop in one line
Dictionary Comprehension	{k: v for k, v in pairs}	Create a dictionary using a loop in one line
while Loops	while condition:	Loop while a condition is True
break	if condition: break	Exit the loop immediately
continue	if condition: continue	Skip the current loop iteration
enumerate()	for i, val in enumerate(seq):	Loop with index and item
zip()	for a, b in zip(list1, list2):	Loop over multiple sequences in parallel
Infinite Loop	while True:	Runs forever unless externally stopped